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A wonderful sexual act, with the utmost degree of diffuculty. The act is successfully performed when a woman is sitting in the toilet facing backwards and taking a shit while giving a man a grumpkin while the man is taking a shit in the tank (an upper decker). Best performed on a public toilet, "friends" toilet, or at work. The reverse technique with the woman recieving head on the tank from a man on the toilet is referred to as a cookie monster.
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